Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....86...32b&link_type=abstract
Astronomy and Astrophysics, vol. 86, no. 1-2, June 1980, p. 32-35. NASA-supported research.
Astronomy and Astrophysics
Astrophysics
26
Atomic Energy Levels, Electron Transitions, Solar Corona, Solar Spectra, Electron Density (Concentration), High Resolution, Line Spectra, Oxygen Ions, Solar Atmosphere, Transition Probabilities, Ultraviolet Spectra
Scientific paper
High resolution observations of intersystem lines of S IV near 1400 A are available from Skylab. These lines are potentially useful as density diagnostics for the solar atmosphere. Energy levels, transition probabilities and collision strengths have, therefore, been calculated for S IV, including the configurations 3x(2)3p, 3s3p(2), and 3s(2)3d. Line intensities and level populations have been calculated as a function of electron density. The calculated population of the 3s3p(2) (4)P(5/2) level is found to reach a pseudo-Boltzmann equilibrium at a density which is four times higher than is inferred from solar spectra and level population calculations of lighter ions such as O IV.
Bhatia Anand K.
Doschek George A.
Feldman Uri
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